billion

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈbɪljən/US:USA pronunciation: IPA and respellingUSA pronunciation: IPA/ˈbɪljən/ ,USA pronunciation: respelling(bilyən)

Inflections of 'billion' (n):
billions
npl (Used without a preceding number—e.g. "This development cost billions of dollars.")
billion
npl (Used with a preceding number—e.g. "The company's value is estimated at $10 billion.")
WordReference Collins English Usage © 2025
billion
A billion is a thousand million, or 1,000,000,000.
The website gets almost a billion visits each month.
Be careful
Don't add ‘-s’ to billion when you put another number in front of it.
In January 1977, there were 4 billion people in the world.
Numbers and fractions

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